\begin{tikzpicture}
    \tkzDefPoints{0/0/A,  2.5/0/B}
    \tkzDefPoint(70:4){D}
    \tkzDefShiftPoint[B](50:1.5){C}
    \tkzDrawPolygon(A,B,C,D)
    \tkzLabelPoints[left](A,D)
    \tkzLabelPoints[right](B)
    \tkzLabelPoints[above=0.5em](C)
    %\tkzCalcLength(C,D) \tkzLabelSegment(C,D){\tkzLengthResult}
\end{tikzpicture}

